ITEM NAME:ZMQ-2729 AC 110/220V Industrial Continuous Sound Electronic Buzzer U4I1 ZMQ-2729 AC 110/220V Industrial Continuous Sound Electronic Buzzer U4I1 Product Name : Electronic Buzzer; Sound-making Type : Continuous Sound Rated Voltage : AC 110/220V; Sound Pressure : more than 80dB; Operating Temperature : -20a Celsius to +45a Celsius Body Diameter : 30mm / 1.2"; Overall Size : 61 x 30 x 28.5mm / 2.4" x 1.2" x 1.1"(L*W*H); Mounting Hole Diameter : 3.5mm / 0.138" Wire Length : 20cm / 7.9"; External Material : Plastic; Color : Black, Green Weight : 16g; Plastic housing, AC110-240V working voltage, Green 2 wire, convenient for wiring. An ideal item for industrial use. Package Content : 1 x Electronic Buzzer Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..Sound-making Type : Continuous Sound. An ideal item for industrial use. Sound Pressure : more than 80dB;. Note:Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.